TY - GEN
T1 - Nonlinear laser-like ocean waves radiation orthogonal to the wind
AU - Pushkarev, Andrei
AU - Zakharov, Vladimir
N1 - Funding Information:
This research was funded by Russian Science Foundation grant N 19-72-30028. The authors gratefully acknowledge the support of this foundation.
Publisher Copyright:
© 2020 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 2020
Y1 - 2020
N2 - We study deep water ocean wind-drivenwaves in strait, with wind directed orthogonally to the shore, through exact Hasselmann equation. The strait has "dissipative" shores, there is no any reflection from the coast lines. We show that the wave turbulence evolution can be split in time into two different regimes. During the first regime, the waves propagate along the wind, and the wind-driven sea can be described by the self-similar solutions of Hasselmann equation. The second regime starts later in time, after significant enough wave energy accumulation at the down-wind boundary. Since this moment the ensemble of waves propagating against the wind starts its formation. Also, orthogonal to the wind waves, propagating along the strait, start to appear. The wave system eventually reaches asymptotic stationary state in time, consisting of two co-existing states: the first, self-similar wave ensemble, propagating with the wind, and the second.quasi-monochromatic waves, propagating almost orthogonally to the wind direction, and tending to slant against the wind at the angle of 15. closer to the wave turbulence origination shore line. Those "secondary waves" appear only due to intensive nonlinear wave-wave interaction. The total wave energy exceeds its "expected value" approximately by the factor of two, with respect to estimated in the absence of the shores. It is expected that in the reflective shores presence this amplification will grow essentially. We propose to call this "secondary" laser-like Nonlinear Ocean Waves Amplification mechanism by the acronym NOWA.
AB - We study deep water ocean wind-drivenwaves in strait, with wind directed orthogonally to the shore, through exact Hasselmann equation. The strait has "dissipative" shores, there is no any reflection from the coast lines. We show that the wave turbulence evolution can be split in time into two different regimes. During the first regime, the waves propagate along the wind, and the wind-driven sea can be described by the self-similar solutions of Hasselmann equation. The second regime starts later in time, after significant enough wave energy accumulation at the down-wind boundary. Since this moment the ensemble of waves propagating against the wind starts its formation. Also, orthogonal to the wind waves, propagating along the strait, start to appear. The wave system eventually reaches asymptotic stationary state in time, consisting of two co-existing states: the first, self-similar wave ensemble, propagating with the wind, and the second.quasi-monochromatic waves, propagating almost orthogonally to the wind direction, and tending to slant against the wind at the angle of 15. closer to the wave turbulence origination shore line. Those "secondary waves" appear only due to intensive nonlinear wave-wave interaction. The total wave energy exceeds its "expected value" approximately by the factor of two, with respect to estimated in the absence of the shores. It is expected that in the reflective shores presence this amplification will grow essentially. We propose to call this "secondary" laser-like Nonlinear Ocean Waves Amplification mechanism by the acronym NOWA.
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M3 - Conference contribution
AN - SCOPUS:85099370672
T3 - Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE
BT - Ocean Engineering
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering, OMAE 2020
Y2 - 3 August 2020 through 7 August 2020
ER -